Code result
P2A9A
Alternative Fuel Tank Select Valve C Control Circuit Performance
High severity
What it means
The control circuit of alternative fuel tank select valve C reports a control performance condition. Tank selection on multi-tank CNG/LPG systems cannot be commanded reliably.
Is it safe to drive?
No — stop driving
This code can put the vehicle into limp or reduced-power mode. Avoid extended driving and have the vehicle diagnosed promptly.
Most likely causes
Valve stuck in last commanded position
highOne of the most commonly reported causes for this code — check this first.
Coil force degraded
mediumA plausible cause — test and verify before replacing parts.
Related help
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